<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :on-exceed="handleExceed"
      :on-error="handleUploadError"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      :limit="limit"
      class="upload-file-uploader"
      ref="fileUpload"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">选取文件</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        :key="file.url"
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in fileList"
      >
        <el-link :href="`${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document">
            {{ getFileName(file.name || file.url) }}
          </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :underline="false" @click="handleDelete(index)" type="danger"
            >删除</el-link
          >
        </div>
        <div v-if="file.time">{{file.time}}秒</div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  name: "FileUpload",
  props: {
    // 值
    parfileList: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 1,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["mp3","m4a"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    getAudioList: {
      type: Function,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/common/uploadMinio", // 上传文件服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      flag: false,
    };
  },
  watch: {
    parfileList: {
      handler(val) {
        if (val) {
          this.fileList = val;
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        const fileName = file.name.split(".");
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
          this.$modal.msgError(
            `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          );
          return false;
        }
      }
      // // 校检文件大小
      // if (this.fileSize) {
      //   const isLt = file.size / 1024 / 1024 < this.fileSize;
      //   if (!isLt) {
      //     this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
      //     return false;
      //   }
      // }
      
      this.$modal.loading("正在上传文件，请稍候...");
      this.number++;
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.msgError("上传文件失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传成功回调
     handleUploadSuccess(res, file) {
      if (res.code === "200") {
        //计算音频时长
        this.getTimes(file.raw)
        this.uploadList.push({
          name: res.data.originalFilename,
          url: res.data.url,
          time:''
        });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.fileUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    //获取音频时长
    getTimes(file) {
      var total;
      var content = file
      //获取录音时长
      var url = URL.createObjectURL(content);
      //经测试，发现audio也可获取视频的时长
      var audioElement = new Audio(url);

      audioElement.addEventListener("loadedmetadata", (_event) => {
        //保存获取时间长度
        console.log('时长',audioElement.duration)
        this.flag = true
        this.uploadList[0].time = audioElement.duration
        
      });
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      this.$emit("input", this.fileList);
    },
    // 上传结束处理
    uploadedSuccessfully() {
      let timer = setInterval(() => {
        if (this.number > 0 && this.uploadList.length === this.number && this.flag) {
          console.log('2222222222',this.uploadList)
          this.fileList = this.fileList.concat(this.uploadList);
          this.uploadList = [];
          this.number = 0;
          this.$emit("input", this.fileList);
          this.getAudioList(this.fileList);
          this.$modal.closeLoading();
          clearInterval(timer)
        }
      },1000)
      
    },
    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
      } else {
        return name;
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
